2nd Grade Screens River Rocks!

Second graders have been investigating what happens when screens are used with a river rock mixture!

Right away we noticed that the rock mixture
has rocks of different sizes.

We also noticed that the rocks are different
colors.

The classes explored with three different sized screens and thought about what happened to the rock mixture when they used the screens.

Some of the rocks can be pushed through the screen.

Writing down observations.

One rock is stuck in the screen!

Then they experimented with the screens.  What happens with the rock mixture when it is poured through all three screens at the same time?

Most of us came to the same conclusion - The big rocks didn't go through any of the screens, the medium rocks stayed on the medium screen, the small rocks stayed on top of the small screen and the smallest rocks went through all four screens!